Receivers Direction Finders

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Lilian Thomas
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1 Receivers Direction Finders HF Receiver E 724 KW/2 1.5 to 30 MHz Leaflet IB 467/2 E Main selectivity (adjacent channel selectivity) provided by mechanical filters; a maximum number of eight different bandwidths can be provided. Fully transistorised, with extensive utilisation of integrated circuits, thus small current drain, long life expectancy and little maintenance requirements. v. Synoptically arranged, sturdy light alloy construction; small volume but good accessibility through adoption of modular assembly system. Suitable for mains and battery operation. Facility for connecting panorama units. m Suitable for incorporation in long distance traffic communications receiver equipments. Operating ambient temperature range from -20 C to +50 C. Technical Remarks _ /1 HF Receiver E 724 KW/2 Applications The HF Receiver E 724 is suitable for universal utilisation as service receiver for telegraphy and telephony traffic links, including SSB operation, and as search and surveillance receiver. Special Features Rapid and exact search operation with single-knob tuning control. Electronic frequency read-out with digital numicator tubes giving uniform resolution throughout the frequency range. Excellent setting accuracy, by virtue of digital readout of the reception frequency. High precision crystal controlled reference frequency generator. Upon request, fitted with binary coded output for remote communication or print-out of the reception frequency value. Good frequency stability in the face of vibration, mechanical shock and temperature fluctuations, through the use of a variometer-tuned oscillator housed in a thermostat. Five tuned RF preselector circuits. When searching for a wanted transmitter, it is desirable to be able to tune the receiver solely with reference to its frequency scale. This calls for very good scale resolution and high setting accuracy, especially for receiving SSB telephony and telegraphy signals. In the E 724, the reception frequency is displayed with digital numicator tubes giving a resolution of 100 Hz. For radio reconnaissance it is necessary to sweep-tune through large frequency ranges as rapidly as possible. Once the wanted transmitter has been found, its frequency must be precisely determinable. The E 724 has been designed as a single superheterodyne receiver with continuously tuned free-running oscillator (VFO tuning system). This provides genuine single-knob tuning control with only 4 frequency subranges. The actual frequency of the sole frequency-determining oscillator is measured with a digital

2 ~ frequency meter and converted to the reception frequency by electronic computation. This obviates all previously necessary calibrating procedures, so that the reception frequency can be read-off directly and accurately. Remote communication or registration of the reception frequency value is necessary for some purposes. Upon request, the E 724 can be fitted with a binary coded output of the reception frequency value, e.g. for connecting a data printer for quick registration, or a repeater display unit for remote readout of the reception frequency. The setting accuracy and readout tolerance of the receiver are determined only by the precision of the crystal reference frequency. The E 724 incorporates a high precision 1 MHz crystal reference frequency generator housed in a thermostat. The operating voltage is carefully stabilised. High readout resolution and setting accuracy call for correspondingly good frequency stability of the receiver tuning. The frequency-determining oscillator of the E 724 is tuned by inductance variation with a ferrite core. The frequency subrange selection is effected by switching oscillator frequency multiplier. Thus there are no sliding, switching or plug contacts within the frequency-determining circuit. Airtight sealing prevents entry of moisture and dust. The oscillator is housed in a proportionally regulated thermostat and the operating voltage is carefully stabilised. Mechanical vibration is encountered in vehicles. This must not adversely affect the performance of a receiver. In this respect the inductively tuned oscillator is superior to a conventional variable capacitor tuning system, since the former is assembled as a mechanically self-contained module attached to the receiver via a rigid baseplate, so that no shear and torsional contortions can result. The dense congestion in the HF bands calls for outstandingly good selectivity of the receiver. Thus the main selectivity (adjacent channel selectivity) of the E 724 has been provided in lumped form with mechanical filters ahead of the IF amplifier. A superheterodyne receiver is inherently prone to response frequency ambiguities. The number of subsidiary response frequencies increases with the number of frequency conversions employed in the receiver circuit line-up. The E 724 has been designed a single superheterodyne receiver, to keep the number of possible subsidiary response frequencies small. The residual subsidiary response frequencies must be suppressed to a sufficient extent, so that they do not interfere with normal operation. The E 724 possesses 5 tuned RF circuits for signal frequency preselection and thus achieves high rejection factors for image frequencies and IF breakthrough. The atmospherics interference level is large in the HF band. A transmitter can be received properly only if its signal strength at the site of the receiver exceeds the atmospherics noise level. Thus excessive receiver sensitivity is of no use, and actually detrimental, because the susceptibility of the receiver to cross-modulation.increases with increasing input sensitivity. Thus excessive input sensitivity has been deliberately avoided in the E 724. It should be possible to operate the receiver independently of a mains power supply. The E 724 is fully transistorised. Apart from numerous other advantages (small volume, light weight, little maintenance), this results in small current drain, making possible battery operation. The E 724 is easily converted for battery operation. The receiver should be adaptable to all encountered types of service. The E 724 forms the basic unit of a carefully planned equipment system. Facilities have been provided for connecting numerous ancillary units, permitting full extension to long distance traffic communications receiver equipments. M Small size is important not only in vehicles, but also for utilisation in fixedsite stations, so that the receiver together with the ancillary units usually required for handling present day traffic, can be accommodated within the limited space available in the radio operator working position. The volume of the E 724 is less than 20% of that of the HF Communications Receiver E 104 previously utilised for comparable tasks. Technical Specifications Frequency Range: 1.5 MHz to 30 MHz Service Types: A1 A2 A3 A3J CW telegraphy MCW telegraphy AM telephony SSB telephony In conjunction with ancillary units: F1 F1 F4 F6 ASA A3B A4 2-frequency FSK telegraphy (teletype, multiplex) 3-frequency FSK telegraphy (data transmission) 2-frequency FSK telegraphy (facsimile, weather maps) 4-frequency FSK telegraphy (Code 1 and 2, Channel A and B) SSB telephony with AGC and AFC according to residual carrier component SSB telephony with two independent sidebands (ISB) facsimile, picture transmission

. Frequency Subranges: Subrange 1: Subrange 2: Subrange 3: Subrange 4: Tuning Coarse Drive: Fine Drive (mechanically reduced): Tuning Fine (electrically reduced): Frequency Readout: Resolution:

3 . Frequency Subranges: Subrange 1: Subrange 2: Subrange 3: Subrange 4: Tuning Coarse Drive: Fine Drive (mechanically reduced): Tuning Fine (electrically reduced): Frequency Readout: Resolution: Readout Error: Frequency Drift for +10 Cto +40 C: for ±10% mains voltage fluctuation or 21.5 to 30 V battery voltage fluctuation: RF Input (Antenna) Signal Permissible Overvoltage: Threshold Sensitivity: Parasitic Oscillator Voltage across 60 Q: Broadband IF Output Nominal Frequency: Bandwidth: Voltage across 50 Q (with AGO): Narrow Bandwith IF Output Nominal Frequency: Voltage across 50 Q (with AGC): 1.50 to 3.48MHz 3.46 to 7.48MHz 7.45 to MHz to MHz 13.5 revolutions in each subrange 400 revolutions in each subrange about ±200 Hz (for 270 rotation angle) 6-digit non-flicker display with digital numicator tubes 100 Hz <; 50 Hz + 4 X 10-7 fe Subrange 1: mean 4 Hz/ C Subrange 2: mean 8 Hz/ C Subranges: mean 15 Hz/ C Subrange 4: mean 30 Hz/ C <: 50 Hz 0.5 iv to 100mVEMF 10 VEMF 50 to 75 Q, coaxial mean value 10 kt0 (10 db) Subranges 1. 2 and 3; mean value 20 [xv Subrange 4; mean value 50 jj,v 525 khz about ± 2% of reception frequency, max. 100 khz about 50 Q ;> 20 o,vfor 1 jiv antenna EMF ;> 100 [iv for 100 iv antenna EMF > 1 mv for 100 mv antenna EMF 525 khz ;> 50 mv Voltage Variation (with AGC): Image Frequency Rejection Factors: <; ±2 db for 0.5 about 20 Q 1.5 to 10 MHz 10 to 25 MHz 25 to 30 MHz 100 mv antenna EMF Mean Value 95 db 70 db 60 db Minimum Value 80 db 60 db 50 db IF Breakthrough Rejection Factor: 1.5 to 30 MHz 100 db

J Bandwidths and Selectivity: : Nominal 6 db Band- Bandwidth width (khz) (khz) 60 db Bandwidth (khz) Tolerance of Passband Center Frequency (Hz) Cross-Modulation: AF Outputs Loudspeaker: Headset 19

4 J Bandwidths and Selectivity: : Nominal 6 db Band- Bandwidth width (khz) (khz) 60 db Bandwidth (khz) Tolerance of Passband Center Frequency (Hz) Cross-Modulation: AF Outputs Loudspeaker: Headset 19 mm Sockets: Jack Connector: 600 Q AF Line Output (fitted only to special order) Nominal Signal Level: Signal Level Change withagc: AF Passband: Frequency Response: A1 Service Type Signal/Noise Ratio: AGCTime Constant: Beat Frequency Oscillator (BFO): A2/A3 Service Types Signal/Noise Ratio: Cross-Modulation: ±0.10* ;>±0.10 ± ± 0.25 ;> ± 0.22 <; ± ± 0.75 ± 0.70 <; ± ±1.5 ;> ±1.45 ± ±3.0 ;> ± 2.7 ± 6.5 <, 300 ±6.0 ±5.7 <; ± USB 2.9 ± 8.0 <: 300 LSB ;> 2.9 <: ± * only for A1 service type The bandwidths of ±0.25 khz, ±0.75 khz and ±3 khz have been incorporated in the basic version., 2 unmodulated transmitters produce a signal interference ratio of 20 db for Antenna EMF (mean value) Detuning Wanted Transmitter Interfering Transmitter 1 Interfering Transmitter 2 Interfering Transmitter 1 Interfering Transmitter V 3mV 3mV 15 mv 15 mv max. 0.4 W into built-in loudspeaker max. 20 mw into 4000 Q max. 20 mw into 4000 Q OdBm (max. +10dBm) <; ± 2dB for 0.5 jxv to 100 mv antenna EMF 600 Q ±10% 300 to max Hz, depending on bandwidth setting level to within ± 3 db or better 10 db for 0.4 uv antenna EMF, ± 0.25 khz bandwidth +20 db in about 100 ms 20 db in about 2s tunable through ± 3 khz, Tk <: 10 Hz/ C ;> 20 db for 10 V antenna EMF, ± 3 khz bandwidth, m = ± 20 khz ± 40 khz IE E A modulated interfering transmitter produces a signal/noise ratio of 14 db for: Antenna EMF Modulation Detuning Factor _ AGCTime Constant: Wanted Transmitter Interfering Transmitter Interfering Transmitter ±20dBin about 100ms 100 u,v 30 mv 100 mv 50% 50% 50% 0 ± 20 khz ± 20 %

~ : Harmonic Distortion Factor: A3J Service Type Signal/Noise Ratio: AGCTime Constant: Harmonic Distortion Factor: Carrier Reinsertion Oscillator: Oscillator Output Frequency: Crystal Reference

5 ~ : Harmonic Distortion Factor: A3J Service Type Signal/Noise Ratio: AGCTime Constant: Harmonic Distortion Factor: Carrier Reinsertion Oscillator: Oscillator Output Frequency: Crystal Reference Frequency Output Frequency: Frequency Uncertainty: Frequency Drift: Ageing: Frequency Meter Output: Binary Coded Output: Voltage for "L": Voltage for "O": Takeover Blockage: Short Circuit Takeover Pulse Voltage Amplitude: Pulse Duration (Width): Repetition Frequency: Mains Power Supply Frequency: Power Consumption: Battery Power Supply Permissible Overvoltage: Current Drain: <! 5% for 0 dbm and 1 mv antenna EMF, m = 0.3 ;> 20 db for 3 [iv antenna EMF, 3 khz bandwidth + 20 db in about 100ms - 20 db in about 2s <; 5% for 0 dbm, 1 mv antenna EMF frequency uncertainty < 20 Hz frequency drift <jj 20 Hz 2 MHz to 32 MHz ;> 5 mv across 50 Q about 50 Q 100kHz <; <; 1-10-e/year about 2 kq A frequency meter output can be provided upon request Code 5.5V EMF 0.5V EMF about 5 kq by short-circuiting to chassis < 50 Q about 50 Q about 300 [AS 25 Hz 1 10/220 V ±10% 45 to 480 Hz for "preheating" max. 80 VA (at +25 C for about 15 minutes after switching on) during "operation" about 60 VA at +25 C 21.5 to 30 V, negative pole to chassis max. 90 V for 1 ms max. 3 A for "preheating" (at +25 C for about 15 minutes after switching on) during "operation" about 1.5 A at +25 C ~ Ambient Conditions Temperature: + 10 Cto +40 C -20 Cto +50 C -40 Cto +70 C full guarantee of performance specifications may be operated may be stored

6 Humidity: Vibration and Shock: Operation is permissible for 96 hours at +40 C ambient temperature and 90% relative humidity. A mean relative humidity of 75% is permissible throughout the service life of the unit. No damage results if the switched-on unit is subjected to vibration with a stroke of ±0.5 mm at 10 to 30 Hz, or with an acceleration of 2 g at 30 to 70 Hz. The unit is able to operate whilst being subjected to vibration with a stroke of ± 1 mm at 5 Hz. No damage results if the switched-on unit is subjected to a jolt with 10 g acceleration and 10 ms duration. Dimensions and Weights: Height mm Width mm Depth mm Weight approx. kg in cabinet: as drawer unit: 315* * overall dimension, including rubber feet Scope of Delivery 1 HF Receiver E 724 KW/2 with desk cabinet 1 Description and Operating Instructions 1 Mains Cable with Grounded Plug, 1 Antenna Plug HF 4 13, 50 to 75 Q, Type SHF 13 s-2, suitable for Type 1.5/6.5 L Cable 1 26-pole Shorting Plug, 1 Set of Spare Fuses according to Drawing No. 5L according to Drawing No. 5N according to Drawing No Further details are given in our Description KB 031/1 E. AEG-TELEFUNKEN Geschaftsbereich Nachrichten- und Datentechnik Export Fachbereich Hochfrequenztechnik Technische Informationsstelle 79 Ulm ElisabethenstraBe 3 Not binding for delivery If reproduced source must be acknowledged Printed in Western Germany N1 2.1 Jan.70(Eb).

: Triple PLL, lowest reference frequency 10 khz. : ± 5 khz in 10 Hz steps, synthesized.

: Triple PLL, lowest reference frequency 10 khz. : ± 5 khz in 10 Hz steps, synthesized. PETER DE CONINCK HAGENUK RX 1001MVB RECEIVER ONL4234 SERIAL N 5820-310-6162 BELGIAN SWL DRAWING N 97 8 2.164 Technical data Frequency range Frequency resolution Frequency tuning Frequency synthesizer Frequency